During one of the several occasions when the Indians rose against their taskmasters to free themselves from the mita--a system which compelled one-seventh part of the male population to labour in the mines--the lake, for a long time, afforded them a place of refuge. In some places along the shores, beds of rushes exist nine leagues long and one broad. In the midst of them there is an island, to which lanes were cut through the tangled mass. This watery labyrinth was navigated by the Indians in their balsas; and, secure in their retreat, they contrived to make inroads on the Spanish towns in the neighbourhood for a length of time. (These balsas are composed of reeds, tightly fastened together on the sides, in the form of boats, and are propelled both by sails and paddles.) Several of the Indian chiefs were at length captured and executed. This, however, only exasperated the rebels, who, under an enterprising leader, attacked the bridge over the Desaguadero, and carried off the heads of their chiefs, which had been stuck on poles above it. The Spanish troops sent against them waded to some islets, but the Indians, hovering round them in their balsas, prevented them from advancing further. At length the Spaniards embarked in twenty balsas, and came in sight of the native squadron. The Indians, however, going in and out among the lanes and rushes, baffled their oppressors, cutting off several Spanish balsas. A party of cavalry also, advancing into the swampy ground, was suddenly surrounded and cut to pieces, with a loss to the Indians of only three men. These outbreaks, and the far more important rebellion under Tupac Amaru, show that Spanish tyranny had not entirely succeeded in crushing the spirit of the Indians. During the civil wars which for so long devastated the Spanish provinces of South America, the Indians fought with a courage fully equal to that of the whites. THE PUNA.